LibWeb: Fix a spec link in CSS/Parser

This pointed to the wrong part of the spec, make it point to the right
part instead :P

Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp

@@ -8746,7 +8746,7 @@ private:
     ComponentValue m_component_value;
 };
 
-// https://html.spec.whatwg.org/multipage/images.html#parse-a-srcset-attribute
+// https://html.spec.whatwg.org/multipage/images.html#parsing-a-sizes-attribute
 Length Parser::Parser::parse_as_sizes_attribute()
 {
     Optional<Length> size;